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Commit ce11020f authored by Xiubo Li's avatar Xiubo Li Committed by Mark Brown
Browse files

regcache: flat: Introduce register strider order 



Here we introduce regcache_flat_get_index(), which using register
stride order and bit rotation, will save some memory spaces for
flat cache. Though this will also lost some access performance,
since the bit rotation is used to get the index of the cache array,
and this could be ingored for memory I/O accessing.

Signed-off-by: default avatarXiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 8b31ec55

drivers/base/regmap/regcache-flat.c

+15 −5
Original line number Original line Diff line number Diff line
@@ -16,20 +16,30 @@ 




#include "internal.h"

#include "internal.h"





static inline unsigned int regcache_flat_get_index(const struct regmap *map,

						   unsigned int reg)

{

	return regcache_get_index_by_order(map, reg);

}



static int regcache_flat_init(struct regmap *map)

static int regcache_flat_init(struct regmap *map)

{

{

	int i;

	int i;

	unsigned int *cache;

	unsigned int *cache;





	map->cache = kcalloc(map->max_register + 1, sizeof(unsigned int),

	if (!map || map->reg_stride_order < 0)

			     GFP_KERNEL);

		return -EINVAL;



	map->cache = kcalloc(regcache_flat_get_index(map, map->max_register)

			     + 1, sizeof(unsigned int), GFP_KERNEL);

	if (!map->cache)

	if (!map->cache)

		return -ENOMEM;

		return -ENOMEM;





	cache = map->cache;

	cache = map->cache;





	for (i = 0; i < map->num_reg_defaults; i++)

	for (i = 0; i < map->num_reg_defaults; i++)

		cache[map->reg_defaults[i].reg] = map->reg_defaults[i].def;

		cache[regcache_flat_get_index(map, map->reg_defaults[i].reg)] =

				map->reg_defaults[i].def;





	return 0;

	return 0;

}

}
@@ -47,7 +57,7 @@ static int regcache_flat_read(struct regmap *map, 
{

{

	unsigned int *cache = map->cache;

	unsigned int *cache = map->cache;





	*value = cache[reg];

	*value = cache[regcache_flat_get_index(map, reg)];





	return 0;

	return 0;

}

}
@@ -57,7 +67,7 @@ static int regcache_flat_write(struct regmap *map, unsigned int reg, 
{

{

	unsigned int *cache = map->cache;

	unsigned int *cache = map->cache;





	cache[reg] = value;

	cache[regcache_flat_get_index(map, reg)] = value;





	return 0;

	return 0;

}

}